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<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        h3 span {
            font-size: 12px;
            float: right;
        }
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<body>

    <!-- 标题 -->

    <!-- 分块优先按照内容分    先分上下，再分左右 -->

    <h3>Case <span>案例</span></h3>

</body>

</html>